Простейшие арифметические действия - Assembler

#define _CRT_NONSTDC_NO_WARNINGS
#include <stdio.h>
#include <conio.h>
 
int add(int a, int b)
{
    int c;
    __asm
    {
        push eax;
        push ebx;
 
        mov eax, a;
        mov ebx, b;
 
        add eax, ebx;
        mov c, eax;
 
        pop ebx;
        pop eax;
    }
    return c;
}
 
int sub(int a, int b)
{
    int c;
    __asm
    {
        push eax;
        push ebx;
 
        mov eax, a;
        mov ebx, b;
 
        sub eax, ebx;
        mov c, eax;
 
        pop ebx;
        pop eax;
    }
    return c;
}
 
int mul(int a, int b)
{
    int c;
    __asm
    {
        push eax;
        push ebx;
 
        mov eax, a;
        mov ebx, b;
 
        mul eax;
        mov c, eax;
 
        pop ebx;
        pop eax;
    }
    return c;
}
 
int div(int a, int b)
{
    int c;
    __asm
    {
        push eax;
        push ebx;
 
        mov eax, a;
        mov ebx, b;
 
        div eax;
        mov c, eax;
 
        pop ebx;
        pop eax;
    }
    return c;
}
 
int Function(int a, int b, int c, int d, int e)
{
    int tmp;
    tmp = div(d,e);
    tmp = mul(c,tmp);
    tmp = sub(b,tmp);
    tmp = add(a,tmp);
    return tmp;
}
 
void main()
{
    int a, b, c, d, e;
    printf("a = ");
    scanf("%d",&a);
    printf("b = ");
    scanf("%d",&b);
    printf("c = ");
    scanf("%d",&c);
    printf("d = ");
    scanf("%d",&d);
    printf("e = ");
    scanf("%d",&e);
    printf("f(a,b,c,d,e) = %d", Function(a,b,c,d,e));
    getch();
}